package com.system.dto;

import java.util.ArrayList;
import java.util.List;


import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;

import org.springframework.data.jpa.domain.Specification;
import org.springframework.util.StringUtils;

import com.system.entity.Permission;


public class PermissionDTO 
{
	private Long id;
	private String permission;
	private String description;
	private Boolean Select;
	

	public Long getId() {
		return id;
	}
	public String getPermission() {
		return permission;
	}
	public String getDescription() {
		return description;
	}
	public Boolean getSelect() {
		return Select;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public void setPermission(String permission) {
		this.permission = permission;
	}
	public void setDescription(String description) {
		this.description = description;
	}
	public void setSelect(Boolean select) {
		Select = select;
	}
	
	public static Specification<Permission> getSpecification( final PermissionDTO permissionDTO)
	{
		Specification<Permission> spec = new Specification<Permission>() {
			public Predicate toPredicate(Root<Permission> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
				//1.Predicate查询条件集合
				 List<Predicate> list = new ArrayList<Predicate>(); 
				 
				//2.根据 QueryDTO数据字段的值进行判断以及条件的组装
				 if(null != permissionDTO && !StringUtils.isEmpty(permissionDTO.getPermission())) {
					 Predicate  p1 =  cb.like(root.get("permission").as(String.class),"%"+ permissionDTO.getPermission()+ "%");
					 list.add(p1);
				 }
				 if(null != permissionDTO && !StringUtils.isEmpty(permissionDTO.getDescription())) {
					 Predicate  p2 =  cb.like(root.get("description").as(String.class),"%"+ permissionDTO.getDescription()+ "%");
					 list.add(p2);
				 }
				 //3.Predicate查询条件集合的 size 创建对应的Predicate查询条件数组
				 Predicate[] p = new Predicate[list.size()];  
				 //4.CriteriaBuilder的and 函数组装 查询条件数组
				 return cb.and(list.toArray(p));  
			}
		};
		return spec;	
	}
}
